The brown Artist's bracket fungus is pictured here feathering a trunk

Artist’s Bracket is usually a bad sign

Names: Ganoderma applanatum, Artist’s Bracket, Artist’s Conk, Flacher Lackporling, also classified as (Boletus applanatus, Fomes applanatus, Fomes vegetus, Ganoderme aplani, Ganoderma lipsiense, Polyporus applanatus and Polyporus vegetus)
Hosts: Broadleaves, especially beech and poplar.
Attacks: Dead heartwood and living sapwood.
Consequences: Softening of wood and may lead to windthrow or root fracture.